[llvm] dcdc776 - [PGO][test] Add test to check memops changes function hash

[Hiroshi Yamauchi via llvm-commits]

Author: Hiroshi Yamauchi
Date: 2020-07-31T09:43:29-07:00
New Revision: dcdc77619e1af61181e7214d292b7e5b59946186

URL: https://github.com/llvm/llvm-project/commit/dcdc77619e1af61181e7214d292b7e5b59946186
DIFF: https://github.com/llvm/llvm-project/commit/dcdc77619e1af61181e7214d292b7e5b59946186.diff

LOG: [PGO][test] Add test to check memops changes function hash

Following up D84782.

Differential Revision: https://reviews.llvm.org/D84953

Added: 
    llvm/test/Transforms/PGOProfile/memop_hash.ll

Modified: 
    

Removed: 
    


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diff  --git a/llvm/test/Transforms/PGOProfile/memop_hash.ll b/llvm/test/Transforms/PGOProfile/memop_hash.ll
new file mode 100644
index 000000000000..aca3b0c4dbeb
--- /dev/null
+++ b/llvm/test/Transforms/PGOProfile/memop_hash.ll
@@ -0,0 +1,25 @@
+; RUN: opt < %s -pgo-instr-gen -S | FileCheck %s
+; RUN: opt < %s -passes=pgo-instr-gen -S | FileCheck %s
+
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture writeonly, i8* nocapture readonly, i32, i1)
+
+define i64 @foo1(i8* %a, i8* %b, i32 %s) {
+entry:
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %a, i8* %b, i32 %s, i1 false);
+  ret i64 0
+}
+
+define i64 @foo2(i8* %a, i8* %b, i32 %s) {
+entry:
+  ret i64 0
+}
+
+; The two hashes should not be equal as the existence of the memcpy should change the hash.
+;
+; CHECK: @foo1
+; CHECK: call void @llvm.instrprof.increment(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @__profn_foo1, i32 0, i32 0), i64 [[FOO1_HASH:[0-9]+]], i32 1, i32 0)
+; CHECK: @foo2
+; CHECK-NOT: call void @llvm.instrprof.increment(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @__profn_foo2, i32 0, i32 0), i64 [[FOO1_HASH]], i32 1, i32 0)